The transformation of map projection is the base for mapping theory and an important component of GIS.
地图投影变换是地图制图理论的基础，也是GIS的重要组成部分。
Maps (on paper or on the screen) are flat surfaces; they require a transformation from the curved surface of the earth to the flat plane: a map projection.
纸上或屏幕上的地图是平面的；它们需要从地球的曲面向平面进行转换：地图投影。
Map projection transformation is a new research and application field of mathematical cartography.
地图投影变换是数学制图学的一个新的研究和应用领域。
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